BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | ATV/UTV ENGINE & COOLING ENGINE & COOLING 1176 DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 4-6 FOR CATEGORY CODES, IMPORTANT EPA/CARB EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND NOTICE REGARDING NOISE REGULATIONS. PRODUCTS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES IF NOT CATEGORIZED AS “1” OR “4”. DESCRIPTION PART # 1.1 bar (16 psi) 1903-0005 DESCRIPTION PART # 1.6 bar (23 psi) 1903-0017 DESCRIPTION PART # 1.8 bar (26 psi) 1903-0018 DESCRIPTION PART # 2.1 bar (30 psi) 1903-0019 RADIATOR CAPS •Old and faulty radiator caps can cause steam and fluid to be pumped out of the radiator overflow hose •A replacement cap is the least expensive and easiest way to solve or troubleshoot your liquid cooled bike/ATV radiator problems • Upgrading to a high-pressure 1.6 bar, 1.8 bar or 2.1 bar from the stock radiator cap is the simplest and least expensive way to avoid over-boiling your engine •Raising your cooling system’s maximum operating pressure increases your coolant’s boiling point, allowing you to ride harder and longer •Black finished cap •Universal fit for most Japanese models along with 2016-to-current model fitments for all KTM/Husqvarna, and from 21-24 all GasGas fitments •High-temperature corrosion-resistant silicone seals FITS MODEL PART # ARCTIC CAT 250 2x4 06-08 1903-0027 250DVX 06-08 1903-0027 300 2x4, 4x4 10-16 1903-0027 300DVX 09-15 1903-0027 300 Alterra 17-23 1903-0027 400 4x4 98-02 1903-0027 425 4x4 11-12 1903-0027 450 4x4 10-15 1903-0027 450 Alterra 16-23 1903-0027 450 XC 11-17 1903-0027 500 4x4 98-09 1903-0027 500 Alterra 17-18 1903-0027 500 Prowler 14-15 1903-0027 500 Prowler 17-22 1903-0027 550 4x4 09-14 1903-0027 550 Prowler 09-15 1903-0027 570 Alterra 19-21 1903-0027 600 Alterra 22-23 1903-0027 650 4x4 04-12 1903-0027 650 Prowler 06-09 1903-0027 700 4x4,Alterra 06-21 1903-0027 700 Prowler 07-17 1903-0027 Wildcat Trail 14-18 1903-0027 1000 4x4 09-17 1903-0027 1000 Prowler 09-17 1903-0027 1000 Wildcat 12-18 1903-0027 CAN-AM Outlander 330 04-05 1903-0031 Outlander 400 04-14 1903-0031 DS 450 08-14 1903-0031 Outlander 450 15-23 1903-0031 Outlander 500 07-15 1903-0031 Defender HD5/HD7/HD8/HD9/HD10 16-23 1903-0031 Renegade 500 08-15 1903-0031 Traxter 01-05 1903-0031 Outlander 570 16-23 1903-0031 Renegade 570 16-21 1903-0031 FITS MODEL PART # CAN-AM (CONT) DS650 00-07 1903-0031 Outlander 650 06-23 1903-0031 Quest 02-04 1903-0031 Rally 03-04 1903-0031 Renegade 650 18-23 1903-0031 Commander 700 22-23 1903-0031 Maverick 700, 800, 1000,Turbo (all) 13-23 1903-0031 Commander 800 11-20 1903-0031 Outlander 800 06-15 1903-0031 Renegade 800 07-15 1903-0031 Outlander 850 16-23 1903-0031 Renegade 850 16-22 1903-0031 Commander 1000 11-23 1903-0031 Maverick X3 Turbo (all) 17-23 1903-0031 Outlander 1000 12-23 1903-0031 Renegade 1000 12-23 1903-0031 CFMOTO CFORCE 400 16-23 1903-0031 CFORCE 500 07-23 1903-0031 ZFORCE 500 16-22 1903-0031 UFORCE 500 08-20 1903-0031 CFORCE 600 10-23 1903-0031 UFORCE 600 11-14 1903-0031 ZFORCE 600 14-15 1903-0031 CFORCE 800 13-23 1903-0031 ZFORCE 800 14-23 1903-0031 UFORCE 800 13-22 1903-0031 ZFORCE 950 20-23 1903-0031 UFORCE 1000 19-23 1903-0031 ZFORCE 1000 18-19 1903-0031 HONDA TRX420 Rancher 07-13 1903-0031 TRX450 R/ER 04-13 1903-0031 TRX500 Foreman/Rubicon 01-13 1903-0031 TRX650 Rincon 03-05 1903-0031 TRX680 Rincon 06-13 1903-0031 TRX700 XX 08-09 1903-0031 FITS MODEL PART # POLARIS Hawkeye (All) 11-15 1903-0028 Trail Blazer 96-97 1903-0027 Xpress 300 96-97 1903-0027 ACE 325 14-15 1903-0028 ACE 325 (15 is HD Model Only) 15-16 1903-0027 Sportsman ETX 15 1903-0028 350L 93 1903-0027 Trail Boss 350L 90-92 1903-0027 400L 94-95 1903-0027 Big Boss 400L 95-97 1903-0027 Ranger 400 H.O. 10-14 1903-0027 Scrambler 400 95-02 1903-0027 Sport 400 94-99 1903-0027 Sportsman 400L 93-97 1903-0027 Sportsman 400 01-04 1903-0028 Sportsman 400 H.O. 08-14 1903-0028 Xplorer 400 95-02 1903-0027 Xpress 400 96-97 1903-0027 Magnum 425 95-98 1903-0027 Xpedition 425 00-02 1903-0028 Sportsman 450 06-07 1903-0028 Sportsman 450 H.O. 16-20 1903-0028 Sportsman 450 H.O. 21-24 1903-0027 ACE 500 17-19 1903-0027 ATP 500 04-05 1903-0028 Big Boss 500 6x6 98-99 1903-0027 Diesel 99 1903-0027 Diesel 00-01 1903-0028 Magnum 500 99 1903-0027 Magnum 500 00-02 1903-0028 Outlaw 500 06-07 1903-0027 Predator 500 03-07 1903-0027 Ranger 500 99-11 1903-0027 Scrambler 500 97-12 1903-0027 Sportsman 500 96-99 1903-0027 Sportsman 500 00-13 1903-0028 Worker 500 99 1903-0027 RADIATOR CAPS •Automotive-quality replacement radiator caps •13 PSI caps •Stamped steel cap with rubber bottom seal 1903-0005 1903-0027
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